Fix flags parsing (options without a value)

[Lekensteyn]

Also fix some typos and white-space issues. Reported at https://github.com/pommi/CGP/issues/88

[Lekensteyn]

By the way, this issue occured because I changed CGP to always include quotes for its options. Previously it would have -E -w 80, after the quoting changes has become "-E" "-w" "80" and obviously '"' != '-' and thus the parser thinks it sees a value.

The cmdline parser is very fragile and does not cope well with deliberate malformed strings, but that should not be an issue most of the time.

[manuelluis]

Thank you.

The parser of the command line is a toy, it was just an easy way to test the functionality.

I think that the interface for the definition of the graph should be a json object, like the example in the code or something in the middle like this:

{
  "slope_mode": true,
  "end": "1305798665",
  "start": "end-1h",
  "width": 600,
  "height": 120,
  "title": "Load",
  "vertical_label": "System load",

  "data": [
    "DEF:s_avg=data/load.rrd:shortterm:AVERAGE",
    "DEF:s_min=data/load.rrd:shortterm:MIN",
    "DEF:s_max=data/load.rrd:shortterm:MAX",
    "DEF:m_avg=data/load.rrd:midterm:AVERAGE",
    "DEF:m_min=data/load.rrd:midterm:MIN",
    "DEF:m_max=data/load.rrd:midterm:MAX",
    "DEF:l_avg=data/load.rrd:longterm:AVERAGE",
    "DEF:l_min=data/load.rrd:longterm:MIN",
    "DEF:l_max=data/load.rrd:longterm:MAX"
  ],

  "graph": [
    "AREA:s_max#B7EFB7",
    "AREA:s_min#FFFFFF",
    "LINE1:s_avg#00E000: 1m average",
    "GPRINT:s_min:MIN:%4.2lf Min,",
    "GPRINT:s_avg:AVERAGE:%4.2lf Avg,",
    "GPRINT:s_max:MAX:%4.2lf Max,",
    "GPRINT:s_avg:LAST:%4.2lf Last\n",
    "LINE1:m_avg#0000FF: 5m average",
    "GPRINT:m_min:MIN:%4.2lf Min,",
    "GPRINT:m_avg:AVERAGE:%4.2lf Avg,",
    "GPRINT:m_max:MAX:%4.2lf Max,",
    "GPRINT:m_avg:LAST:%4.2lf Last\n",
    "LINE1:l_avg#FF0000:15m average",
    "GPRINT:l_min:MIN:%4.2lf Min,",
    "GPRINT:l_avg:AVERAGE:%4.2lf Avg,",
    "GPRINT:l_max:MAX:%4.2lf Max,",
    "GPRINT:l_avg:LAST:%4.2lf Last\n"
  ]
}

Something more in the line of a web interface.